Dental process.



UNITED S AT S. PATENT f' wisp-tame. asis. was resse To all whom it 00iicem.-.

Be it known; h t I, Heale A sa s, cit ze the Un ed. States. and. a

resideat f- Qnarge, in; the, un r i requois and fi teofi l mmaih xe nvented an Impmvementin. Dental B-rocesses, of. which. the. following-48a pemfieatms- MWL M QQ -L Q an 'mnmaem n en a proc ses, andhes ion its bje to. D EQYiQlQ a. simple; XBH$1Y and, easymethod' of rawninate th bathe sae lledliaeke crown, wh rein the method maytbe. e ned, ute hearera e. dentist W thout neela qwn: ment, and at a reasonable fee.

In he drawing: 1

Figure 1 shows the first step ofthe process, namely the preparing. ofthe natural tooth crown.

Fig. 2 is a perspective view of the acket cmwnzwith: thezmata'ix remqnedr:

Fig. 3 is a sectional view showing matrix in place and with the amalgam 1n the matrix ready for the insertion of the natural tooth.

Fig. 4 is a similar view showing the jacket crown in place on the root. I

Fig. 5 is a sectional view showing the method of evaporating the mercury from the amalgam.

Fig. 6 is a sectional view showing the completed artificial porcelain crown on the natural tooth. I

In the present embodiment of the invention the crown of the tooth 1 is first cut down, as indicated at 2, to form a shoulder 3 between the root and the prepared portlon 'of the tooth. A jacket crown of porcelain & of suitable size and color and having a cavity 5 to fit onto the prepared port1on 2 of the tooth is next obtained, and a matrix 6 of pure gold and of a size to fit within the cavity -5 is placed therein and the said matrix has a marginal flange 7 at its open end which will extend to the outer or peripheral surface of the jacket. In this matrix is now placed amalgamated gold indlcated at 8, there being a sufficient amount of this amalgamated gold to fill the space between the prepared portion 2 of the tooth and the matrix. The matrix and jacket, with the amalgam in place, are now pressed over the tooth, as indicated in Fig. 4:, until the crown fits down closely against the shoulder The excess amalgam is forced out as indicated at 9. The matrix and acket are now removed, and the matrix is removed from Specification "of Letters Patent.

thejacket, an thema lflimand emelg malle h diovelt. urnenmdie ed.aalq by e lfi Suit bl nst umen n ic ted at,- i.=and.-ithe mammalseaaporatedihy slew. he -.4 1

this. proc sssthere is attained an accurate conformation of the interior of the gold matrix and; thatooth why; means :flfi thee-gold amalgam, so that the matrix and crown of the tooth are made to accurately fit one an other. It will be understood that other materials may be used as well as gold.

In the usual method of crowning teeth by the so-called jacket crown, the tooth is prepared in the manner shown and a pure platinum matrix is burnished over the coneshaped natural crown 2 of the tooth. A body of porcelain is then fused onto the matrix, a step which requires the highest ceramic art to obtain dense porcelain and correctness of shade or color. Furthermore, the platinum matrix will show dark, and if it is removed the crown no lon er fits. With the present method the color 0 the porcelain is not changed and there is a perfect fit.

I claim:

1. A method of crowning teeth, which consists in reducin the crown of the tooth, providing a jacket having a cavity of larger size than the prepared crown, and placing in the cavity a matrix of gold, the matrix having a marginal flange extending to the peripheral surface of the jacket, placing gold amalgam in the matrix, pressing the prepared crown into the matrix to express the surplus amalgam, removing the matrix and jacket and heating to evaporate the mercury, and afterward cementing the jacket to the prepared crown.

2. A method of crowning teeth, which consists in reducing the crown of the tooth, pro viding a jacket having a cavity of larger size than the prepared crown. and placing in the cavity a matrix Of metal, placing gold jacket and heating to evaporate the mercury,

and afterward cementing the jackett'o the edtcro wrn .7

crown approximately circular in c'rcss secticn' and having the vertical" sectionof a gothic arch, --an d 'in forming an annular shoulder betweenthe prepared gcrowni'and the root "of the tooth, providing a; jacket having a cavity' 0f larger-size than the prepared crow-n, placing in the cavitj a matrix of metal, plamng gold amalgam in the ma"- trix, pressingthe prepar'ed'crow-n into the matrix to express the surplus-1 alnalgan'ry're moving the matrix and jacket and heating to evaporate: the mercury-"and afterward 's'ecnring thefjaeket to the prepared crown. 1- :1 4

method of crowning teeth which" consists' in reducing'the peripheral surface of the 'c rcwn ofthe'toot to' form a prepared cr'o'wn approximately circular in cross "sec-.

1 ti'on,- and :in forming an annular shoulder the "tie? b tween the prepared the root of thetpeth,providing aj acket having a cavity "bflarr sizethan'p repared crown, placcavity a matrix of metal, placing g0 d amalgam in the matrix, pressing the p p p1 :ep,a1ted grown into the matrix-itqaexprees 3. friethdd' (if crdwin'gteth which consists in nreducing the pempheral surface of the crcwn of the tooth to form a prepared.

the surplus amalgam, removingtheni'atrix and jacket and-heating to evaporate the mercury and afterward securing the jacket t9 the prepar d crown;-+-*--- 5; A method-bf crown ng teeth which ccncrown. Q I

HENRY WARDBA'BCOGK.

Witnesseszi a 1 WILBUR KER'Ns, E. D. DURHAM.

0091c: of this patent may be obtained for m "cents each, by addressing the commissioner'ot -1atents=, 1 -wi mzton,r.c.v a 

